linux-kernel - Re: [PATCH 1/1] usb: gadget: s3c-hsotg: fix core reset timeout failure

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Message-ID: <CAAe_U6J84JHSGQ2upXfnS_JPUfZwv9HD_xAyjK+8ybsZtuRpiQ@mail.gmail.com>
Date:	Tue, 3 Jul 2012 12:14:10 +0530
From:	"ABRAHAM, KISHON VIJAY" <kishon@...com>
To:	"Du, Changbin" <changbin.du@...il.com>
Cc:	balbi@...com, gregkh@...uxfoundation.org, ben@...tec.co.uk,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] usb: gadget: s3c-hsotg: fix core reset timeout failure

Hi,

On Tue, Jul 3, 2012 at 7:33 AM, Du, Changbin <changbin.du@...il.com> wrote:
> The timeout values were 1000 and timeout issue occured many times on my
> s3c6410 Soc based board (mostly when booting whith USB cable not
> connected). This patch increase the values to 10000 to guarantee the
> success of reset.
>
> Having set timeout to 10000, I printed the remained timeout values
> which can cause timeout issue before this change (tested several times):
> the first timeout value remained:
>         timeout = 8079
>         timeout = 8079
>         timeout = 8078
>         timeout = 8081
> the second timeout value remained:
>         timeout = 7940
>         timeout = 7945
>         timeout = 7940
>         timeout = 7938
> Seeing from above values, I think 10000 is big enough.
>
> Signed-off-by: Du, Changbin <changbin.du@...il.com>
> ---
>  drivers/usb/gadget/s3c-hsotg.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/usb/gadget/s3c-hsotg.c b/drivers/usb/gadget/s3c-hsotg.c
> index f4abb0e..f3e2234 100644
> --- a/drivers/usb/gadget/s3c-hsotg.c
> +++ b/drivers/usb/gadget/s3c-hsotg.c
> @@ -2215,7 +2215,7 @@ static int s3c_hsotg_corereset(struct s3c_hsotg
> *hsotg)
>         /* issue soft reset */
>         writel(GRSTCTL_CSftRst, hsotg->regs + GRSTCTL);
>
> -       timeout = 1000;
> +       timeout = 10000;
>         do {
>                 grstctl = readl(hsotg->regs + GRSTCTL);
>         } while ((grstctl & GRSTCTL_CSftRst) && timeout-- > 0);

how about msleep inside the loop?

Thanks
Kishon
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